Horn for radio speakers



May 26, 1931. w. A. BRocKwAY HORN FOR RADIO SPEAKERS Filed Aug. 18, 1950 Patented May 26., 1931 UNITED STATES WILLIAM A. BROCKWAY, F MARIETTA TOWNSHIP, WHATCOI COUNTY, WASHINGTON PATENT OFFICE HORN FOR RADIO SPEAKERS Application filed August 18, 1930. Serial No. 476,025.

My invention relates to improvements in horns for radio speakers and has for an object to provide resonators with plane or regularly curved sounding boards to operate in conjunction with a non-resonant horn to enlarge the volume of sound emanating from .a radio speaker without adding harsh or rasping qualities thereto.

Another object of my improvement is to provide resonator assemblies to be disposed in part inside of the horn and in part outside thereof to cooperate therewith.

Another object of my improvement is to provide a shape of horn suitable for sound release and also for production from vsheets of non-resonant materials.

Other objects of my improvement will appear as the description proceeds.

I attain these and other objects of my improvement with the device illustrated in the accompanying sheet of drawings, which form a part of this specification, in which Figure 1 is a front elevation of a cabinet with my horn and resonator assemblies in place therein.`

Fig. 2 is a side elevation of Fig. 1, Fig. 3 is a rear elevation of Fig. 1, Fig. 4 is a plan view of Fig. 2 having its top broken away, Fig. 5 is a rear elevation of theinterior resonator and Fig. 6 is an edge elevation of Fig. 5, both so drawn on alarger scale.

Similar characters refer to similar parts throughout. Certain parts are broken away to show other parts hidden thereby.

With more particular reference to the designated parts: A cabinet 7, which may be of any suitable shape and design to house the device, is provided with a large front opening 8 partly closable by Vdoors 9, one of which is shown as open in Fig. 1, and has scroll-work openings in its side walls' as shown at 10 in Fig. 2. In this cabinet isy mounted a horn having neck 11 extended upward, flaring outer end 12 extended horizontally and middle part al1 connecting the neck with the flaring S outer end. Relief openings 13, shown in Fig.

2, are preferably made in the neck.

The horn is supported in the cabinet on cross rails 14 and 15 whichare fastened to the interior beneath the horn.

There are, preferably two, resonator boxes 16 and 17y installed within the cabinet one on` each side of the horn set up on edge on rails 14 and 15. Resonator box 16 has swell-front sounding board @16 preferably facing outwardly from t-he horn, and resonator box 17 has swell-front sounding boarda17 preferablyfacing outward from the other side of the horn. The boxes 16 and 17 preferably taper in width from the narrower rear end to the wider front end, are relatively right and left but otherwise are made alike. Box 17 is shown in section in Fig. 4. Bridgek 1S therein is fastened'to the inner wall of the sounding board to cause the` outward swell therein and place it under tension. y To the inner edge of the bridge is fastened the arm 19 in a horizontal position with ends extended equally on both sides of the vertical bridge. In the rear end of the arm is a small hole into which is extended one end of wooden stud 20 closely fitted and glued fast therein.

Stud 2() is extended through a hole Iin theV back wall of box 17 Vlarge enough not to contact therewith, and said stud is also extended through an opening in one side of the horn with its other end protruding within the horn. Interior resonator orsounding boardy 21 is preferably warped over the curved edge of bridge l22. thereof and fastened thereto to maintain it under tension. Centrally inbridge 22 is hole 23 into which is extended the other end of stud 2O to make a close fit thereinand dispose soundingboard 21 within the horn close to one of the sides thereof.

Resonator box 16 has a bridge and arm therein similar to those in box 17 described, also a wooden stud 2O similar to the one described is connected with the arm in box 16, is extended throughy holes in the box and horn to protrude within the horn where it is firmly joined with another `sounding board 21 in every way similar tothat described. Thus,

as seen in Fig. 4, the two sounding boards 21' face each other within the neck or central part of the horn. j

As stated, I prefer that the horn be nonresonant.- With this in view, in practice, I have made satisfactory horns for my new loud speaker from bagasse board the interior of which I finish with a thin coat of plaster.

y, y g isomer' Interior sounding boards 21 are caused to vibrate in unison with the sounds proceeding from the bottom of radio speaker 24, located on to or horn neck 11, and these sounds are ampliied in the horn by boards 21 so that the sounds proceeding from the flaring end of the horn are greater in volume than When they left speaker 24. Also, vibrating sounding boards 21 cause studs 2O to vibrate in unison 4therewith and through the studs ythe sounds .emanating from the speaker 24v are conveyed to sounding boards w16 and al? by which they are further increased Iin volume and pass from the cabinet through openings 10 in the sides thereof to be added With the sound proceedingy fromthe mouth of the horn 12.

`rIn this manner desired amplification of sound from speaker 24 is attainedby using 20, resonantl areas of regularshapes apart from the nonresonant horn; and much of the harsh, rasping tones attendant on the use of flaring amplifiers is thus avoided.

Having thus disclosed my invention, what 25 I claim as new therein and desire to secure by Letters Patent is, n

1. A radio loud speaker including a nonresonant horn, and two connected sounding boards one of which is disposed Within the horn and the other of which is disposed exterior to the horn. 4 Y Y 2. A radio loudspeaker including a nonresonant horn, and assemblies of connected sounding boards some members of Which are disposed Within the horn and other members of which are disposed exterior to the horn the sounding boards Within the horn connected to the sounding'boards of the same assembly ex- Y vterior to the horn. l

40 3. A radio loud speaker including a non-V resonant horn, a sounding board disposed Within the horn, a sounding board disposed n exterior to the horn, and a sound-conducting member joining the interior andexterior V 45, sounding boards. f y

4. A radio loud speaker including a nonresonant horn, a plurality of assemblies of. sounding boards eachroi Which has a sounding board disposedv Within the hornV and a sounding board'disposed exterior thereto, and

sound-conducting members to join the interior sounding boards with the exterior sounding boards of each assembly.

5. A sounding-board assembly including a sounding board box having an opening in one side Wall thereofand a sounding board providing the other side Wall thereof, la bridge fastened VWithin the box to the sounding-board Wall, an arm fastened to the bridge Within the @9 box, a stud fastened to the arm extended through thevWall opening, and a sounding board exterior to the box fastened to the outer end of the stud. s Y

WILLIAM A. BROCKVVAY.

V i Y 

